Lutron DO-5509 Dissolved Oxygen Meter

This digital dissolved oxygen meter is supplied with a polarographic, type probe with an incorporated temp. Sensor which serves for precise, dissolved oxygen ( do ) and emp. Measurement, applications for aquarium, medical research, agriculture, fish hatcheries, laboratory, water conditioning, mining industry, schools & colleges, quality control, probe cable length : 4 meters, automatic from 0 to 40?.